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The Marsupial Bridge is a one of a kind bridge in the State of Wisconsin. Although it is basically a cable stayed, post-tensioned concrete pedestrian/bicycle facility, the thing that makes it stand alone is the fact that it is supported by a “host” structure, in this case the Holton Street Viaduct across the Milwaukee River on the east side of Milwaukee. It is supported by the column bent piers of the “host” structure and extends the length of the viaduct beneath the deck and between the columns. Functionally, the Marsupial Bridge provides a safe and efficient pedestrian and bicycle access between the burgeoning business district on the south and the growing and developing residential district on the north.
Bloom Companies’ scope of services included structural analysis of the existing Holton Street viaduct to determine its capacity to support the bicycle/pedestrian bridge. Bloom’s services also included examining bridge alternatives, preliminary and final design, and preparation of structural designs, plans, specifications, quantities and estimates, in accordance with AASHTO, WisDOT Facilities Development Manual and the WisDOT Bridge Manual.